Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1991-04-01
1992-03-24
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
13753317, 425562, F16K 1506
Patent
active
050978640
ABSTRACT:
A check valve for use in controlling the flow of thermoplastic material in an injection molding apparatus includes a valve body having an axially extending chamber formed therein with an inlet opening and an outlet opening through which the material can flow. An poppet is slidably movable in the chamber between a valve closed position and a selected valve open position. The poppet has an inlet end with a conical shape and the chamber has a complementary taper portion adjacent the inlet opening, the inlet end and the taper portion sealingly cooperating for preventing flow of material through said chamber when said poppet is in the valve closed position. An adjusting ring is positioned in the chamber for selective movement between a minimum open position and a maximum open position, the adjusting ring being externally threaded for threadably engaging an internal thread formed in the chamber. The poppet has a plurality of radially extending tabs formed thereon for abutting the adjusting ring when the poppet is in the selected valve open position whereby the volume of flow of material through the chamber is porportional to the position of the adjusting ring in the chamber. The poppet also has a plurality of axially extending grooves formed therein for permitting the flow of material from the inlet end of the poppet to an opposite end of the poppet and out the outlet end of the chamber.
REFERENCES:
patent: 1029931 (1912-06-01), Jensen
patent: 1978730 (1934-10-01), Weber
patent: 3438393 (1969-04-01), Godley
patent: 3590439 (1971-07-01), Swanson
patent: 3744751 (1973-07-01), Robinson
patent: 4380422 (1983-04-01), Von Holdt
Kuhman Jeffrey A.
Myers Jeffrey A.
Clemens William J.
Great Lakes Feedscrews, Inc.
Nilson Robert G.
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